275 Large Area Flat Panel Photon Counting Imaging Detectors for Astronomy and Night Time Sensing
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Description: The development of large area, high performance, photon counting, imaging, timing detectors based on novel microchannel plate technology potentially offers significant advantages in a number of applications. To explore this, large area (20 cm) microchannel plates have been constructed using borosilicate microcapillary arrays (20 Î¼m pores) activated by atomic layer deposition. These microchannel plates have demonstrated gain equivalent to conventional microchannel plates, have low background rates (0.07 events cm-2 sec-1), good gain uniformity (10%) and very good lifetime stability (to 7 C cm-2) when using appropriate secondary emissive coatings. Tests with various readout schemes have been done, achieving high thoughput rates of up to 5 MHz and spatial resolution sufficient to resolve individual 20 Î¼m pores. A full process run has been accomplished with a 20 cm format sealed tube configuration. This included deposition of a 20 cm bialkali photocathode with peak quantum efficiency of ~25% at 350 nm, good stability and Â±15% uniformity over the active area. Post process testing demonstrates event time determination better than 200 ps FWHM.
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